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3.11. & 0. MORGAN.

COFFEE MILL.

No. 390,184. Patented Sept. 25, 1888.

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EDGAR H. MORGAN AND CHARLES MORGAN, OF FREEPORT, ILLINOIS, ASSIG-NORS OFONE-THIRD TO ALBERT BAUMG-ARTEN, OF SAME PLACE.

COFFEE-=MILL.

SPECIFICATION forming part of Letters Patent No. 390,184, datedSeptember 25, 1888.

Application filed November 18, 1887. Serial No. 255,496.

To all whom it may concern:

Be it known that we, EDGAR H. MORGAN and CHARLES MORGAN, both residentsof Freeport, in the county of Stephenson and State of Illinois, haveinvented certain new and useful Improvements in Coffee-Mills; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit pertains to make and use the same.

In the drawings, to which this specification refers by letters, Figure 1is a front elevation of the mill, a portion of the top and front beingbroken away. Fig. 2 shows the mill in plan. Fig. 3 is a central verticalsection on the line 00 y ofFig. 2. Figs. 4, 5, and 6 are enlarged viewsshowing details of the adjusting device.

The general features of the mill are similar to those of ordinary sunkenhopper-box mills; but it is thought that the means for retaining thehopper in position, the adjustment, and the means for preventingthecoffee-grains from being thrown from thehopper present patentablenovelty and possess valuable advantages over devices heretoforeemployed.

In the drawings, A is a hopper suspended centrally from the top of anordinary wooden box, B. The hopper is provided at its upper edge with aslight flange, E, which rests upon the upper surface of the box-top. Thecapacity of the hopper is increased by a ring, F, having anoutwardly-turned flange, H, resting upon the box-topjust outside of andsurround ing the hopper-flange, and through the flange H screws G passinto the box-top and firmly fix the ring F thereto. Thegrinding-surfacesare respectively cone and shell, the latter, 0, being formed integrallywith the hopper. A bar, E, extends from side to side of the hopper nearitsjunction with the shell 0, and is enlarged at its middle to form acup or stirrup, N, centrally perforated for the passage of a bolt, 0,which sustains a grinding-cone, P. The upper portion of the bolt 0 isheld in alignment by a bearing, K, supported on the axis of the mill byarms I, extending inward from the ring F. A spherical-shell segment ordisk, J, is formed integrally with the hub K, and serves to prevent theaccidental escape of cofi'ee when the grains chance to slip from (Nomodel.)

the grinding-teeth, while at the same time its margin is everywhere atsuch a distance from the hopper that it scarcely impedes the passage ofthe coffee to the lower portion of the hopper. Upon the bolt 0, andbetween the hub K and the cup or stirrup N, is a sleeve or hollow post,M, which rests in the cup,and through which the screws G exert adownward pressure upon the hopper, holding it firmly in position. Thisforce, being applied at the bottom of the hopper, would, perhaps, beamply sufficient; but for greater strength nails D are drivenhorizontally into the box-top at suitable intervals through perforationsin the upper part of the hopper. Screws might be employed; but theadvantage of this point of construction is that the quickly-insertednail is fully as efficacious, for the nails may be of great length, andno possible strain can even tend to withdraw them,which is not the casewith vertical nails or screws.

The upper part of the body of the bolt 0 is squared, and upon thissquared part slides a crank, Q, for imparting motion to the cone P. Uponthe upper threaded end of the bolt 0, which projects through the crank,is a nut, R, provided with lateral wings S, Fig. 2. The nut R, beforebeing screwed upon the bolt, is dropped into a sleeve, V, groovedvertically upon its interior forthe flanges S, so that it may passvertically back and forth upon the nut. The grooves, however, do notextend to the bottom of the sleeve, and consequently the latter, whileit may readily be raised a short distance, cannot be withdrawn entirelywhen the nut is upon the bolt. It is also evident that as the flanges Sengage the sleeve neither can rotate about the bolt without the other.The lower margin of the sleeve V is notched, Fig. 1, and when at itslowest point, as in Fig. 6, one of these notches engages a lug, T, uponthe crank, preventing the rotation of either sleeve or nut upon thebolt. WVhen it is desired to adjust the mill, the sleeve is raised tothe position shown in dotted lines,disengaging it from the lug T,when itmay be rotated (carrying with it the nut) to any desired extent. IVhenreleased, it again falls to its former position, locking the nut.

For convenience in manipulation, the sleeve is provided with an exteriormilled or crenate flange.

It is immaterial to the ends attained by using the disk .T, formedintegrally with the bearing or hub K, whether the disk be above, below,or in the plane of the arms l, supporting the bearing or hub K; also,whether the arms I be formed integrally with the ring F, whether the barat the bottom of thehopper be formed integrally therewith, whether thehopperilange be continuous, and, also, whether the sleeve M be acomplete sleeve, since it simply acts as a strut to transmit pressurefrom the upper to the lower bar.

Having now fully set forth our invention, what we claim is 1. In acoffee-mill, a burrcarrying spindle rcvol ubly and vertically movable infixed bearings, combined with a crank mounted upon a non cylindricalportion of said spindle and resting upon the upper of said bearings, awinged nut resting upon said crank and working upon the threaded end ofsaid spindle, and a vertically-movable sleeve inclosiug said nut andprovided with internal grooves to receive the wings thereon and withnotches in its lower margin to engage a projection upon said crank,whereby the sleeve normally engaging the crank and insuring simultaneousrotation of the crank, nut, and spindle may, when raised outofengagementwith the crank, serve to rotate the nut alone and thus toadjust the spin dlc with its burr vertically.

2. In combination with the box of a coffeemill and a hopper fixedtherein, a spindlehearing located in the axis of said hopper at a pointbetween its upper and lower limits and supported by integrally-formedarms secured to the box top, and a horizontal disk formed integrallywith said hearing and having its margin at a distance from the walls ofthe hopper somewhat more than the greatest diameter of an ordinarycoffee-grain, all substantially as and for the purpose set forth.

3. In combination with a coffee-mill box and a hopper located thereinand provided with a flange resting upon the box-top, a bar formedintegrally with and extending diametrically across the bottom of saidhopper,a second bar secured upon the top of said box at points out sideof said flange and extending diametrically across and over said hopper,each of said bars being provided at its middle with a spindle bearingadapted to receive a vertical spindle, and a sleeve concentric with saidhearings extending from one to the other and adapted to transmit throughthe firstnamed bar to the hopper-flange the pressure exerted in forcingthe second bar down and securing it upon the hox-top.

In testimony whereof we have signed this specification in the presenceof two subscribing witnesses.

EDGAR ll'. MORGAN. CHARLES MORGAN. Witnesses:

O. W. GRAHAM, J'. A. GRAIN.

